Section 49.—LOCKING DEVICES.
[898]. Common sliding bolt.
![[Larger plate.]](#3701448400155979539_plate51lg.png.id-70329803722716621.wrap-0.html.html){kind=link}
[899]. Common latch.
[900]. Cam locking bolt; locks the bolt when either in or out, so that it can only be moved by the cam spindle.
[901]. Crank movement locking bolt, similar to the last.
[902]. Bolt of common lock.
[903]. Disc and pin.
[904]. Side pawl.
[905]. Locking pawl.
For Pawl and Ratchet Gear see [Section 62].
[906]. Spring catch, with round end which slips past the socket if sufficient force is applied, used for swing doors, &c.
[907]. Another form, bevilled on one side.
[908]. Hook latch.
[909] & [910]. Hasp and staple.
[911]. Crossbar and hooks.
[912]. Hand set screw.
[913]. Drop catch for turntable, &c.
![[Larger plate.]](#3701448400155979539_plate52lg.png.id-2448952174300408968.wrap-0.html.html){kind=link}
[914]. Turning or twisting bolt.
[915]. Rope or rod stopper, with cam lever grip. See [No. 47].
[916]. Chain stop.
[917] & [918]. Spindle grips, to lock a sliding or revolving spindle in a bearing or bush.
[919]. Clamp and screw.
[920]. Sliding shaft locking pin; used for lathe headstock back-gear shafts, &c.
[921]. Lever locking hook; the lever is hinged so that it can be slipped over the hook.
[922]. Bow catch for ladles, skips, &c.
[923]. Segment-slot and bolt fixing for swivelling base.
[924]. Pin lock for turntable or disc.
[925]. T catch.
[926]. Roller and incline slot for locking a rod or rope.
[927]. Revolving bush lock for catch rod; the catch rod can only slip through the bush when the latter is in one position (see [plan view]).
[928]. Wire fencing notches in L or ⊔ iron.
[929]. Trap door automatic catch.
[930]. Screw and bridle suspension, for blast pipes, &c.
[931]. Drop loop fastening for a door.
[932]. Spring stud lock.
![[Larger plate.]](#3701448400155979539_plate53lg.png.id-1095778369683482539.wrap-0.html.html){kind=link}
[933]. Disc and radial slot; the rod can be slipped out sideways when the disc is turned so as to bring the slots together.
[934]. Radial hinged lever and crown ratchet.
[935]. Locking bar to fix a lever in any position.
[936]. Pawl for locking sliding shaft, used for winches, &c., having double and single purchase gear or shifting clutches.
[937]. Fastening eye bolt for a hinged cover; the bolt is also hinged, and can be turned down out of the way. See also [No. 1930].
[938]. Crank arm device, to lock a valve or lever in two positions. See also [No. 16].
[939]. Gun, breech-loading, sliding cylindrical block locked by turning the arm into a notch.
[940]. Door fastening staple and cotter.
[941]. Common cotter.
[942]. Half nut locking and unlocking device, used for lathe leading screws; the half nuts are moved simultaneously in opposite directions by cams on the lever spindle.
[943]. Swinging catch to secure end of a drop bar.
[944]. Tool post, to swivel and lock in any position. See also [No. 493].
[945]. Locking screw, to lock the hand wheel and spur pinion to the shaft when required to be driven by it.
See also Lock Nuts. The common varieties of lever locks with stepped key-wards.
See [No. 1723].